/*
 * Copyright (c) 2022-2022 Huawei Device Co., Ltd. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of
 *    conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
 *    of conditions and the following disclaimer in the documentation and/or other materials
 *    provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
 *    to endorse or promote products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "los_config.h"
#include "los_processlimit_pri.h"
#include "los_process_pri.h"
#include "los_process.h"
#include "los_plimits.h"
#include "los_typedef.h"
#include "los_task_pri.h"

ProcPidLimiter g_procPidLimiter;

void PidLimiterInit(void)
{
    g_procPidLimiter.max = LOS_GetSystemProcessMaximum();
}

void *PidLimiterAlloc(void)
{
    ProcPidLimiter *plimiter = (ProcPidLimiter *)LOS_KernelMalloc(sizeof(ProcPidLimiter));
    if (plimiter == NULL) {
        return NULL;
    }
    memset_s(plimiter, sizeof(ProcPidLimiter), 0, sizeof(ProcPidLimiter));
    return (void *)plimiter;
}

void PidLimiterCopy(UINT8 *dest, UINT8 *src)
{
    (void)src;
    if (dest == NULL) {
        return;
    }
    ProcPidLimiter *plimiterDest = (ProcPidLimiter *)dest;
    plimiterDest->max = LOS_GetSystemProcessMaximum();
    return;
}

STATIC INLINE ssize_t GetPidMax(ProcLimiterSet *procLimiterSet)
{
    ProcPidLimiter *procPidLimiter =
        (ProcPidLimiter *)procLimiterSet->procLimiterList[PROCESS_LIMITER_ID_PIDS]->private;
    return procPidLimiter->max;
}

UINT32 OsPidMaxLimit(LosProcessCB *runProcessCB)
{
    UINT64 pidCount = 0;
    UINT32 intSave;
    UINT32 pid = 1;
    LosProcessCB *pcb = NULL;
    unsigned int pidMaxNum = LOS_GetSystemProcessMaximum();

    LOS_ASSERT(runProcessCB != NULL);
    LOS_ASSERT(g_procLimiterSetArray[runProcessCB->processID] != NULL);
    SCHEDULER_LOCK(intSave);
    UINT64 pidMax = GetPidMax(g_procLimiterSetArray[runProcessCB->processID]);
    if (pidMax == 0) {
        pidMax = pidMaxNum;
    }
    for (pid = 1; pid < pidMaxNum; ++pid) {
        pcb = OS_PCB_FROM_PID(pid);
        if (g_procLimiterSetArray[runProcessCB->processID] == g_procLimiterSetArray[pcb->processID]) {
            pidCount++;
        }
    }
    SCHEDULER_UNLOCK(intSave);
    if (pidCount > pidMax) {
        return LOS_EACCES;
    }
    return LOS_OK;
}
